With its season coming to a close, the Inland Valley Symphony’s final performance promises to live up to every music lover’s fantasy.

On Saturday at the Gershwin Performing Arts Center at Murrieta Mesa High School, the Inland Valley Symphony will present “A Choral Fantasy,” as the conclusion to their 2012-13 season.

“We had an exceptional season and I would say that we doubled our audience size this year, compared to last season,” said Alana Joos, symphony board president, during a recent interview. “This concert is the season finale, so it’s going to be a big concert with 60 musicians, a 50-voice choir and a guest pianist all performing together.”

Under the direction of Maestro Anthony Parnther, the Inland Valley Symphony has been one of the crown jewels of the vast Inland Empire cultural scene for almost two decades, bringing the sophistication of a much larger city to a small but devoted community.

The Temecula Master Chorale, directed by John Byun, has celebrated a partnership with the Inland Valley Symphony for many years, with musical choices being made to highlight the talents of both groups.

“As part of our regular season each year, Anthony Parnther wants to involve the Temecula Valley Master Chorale on one or more of our programs,” Joos said. “In order to involve the chorale, he selected a piece that would satisfy our patrons who really enjoy classical music as well as patrons who really enjoy having the chorale be part of the performance.”

The piece Parnther chose for the season’s final collaboration with the chorale was Beethoven’s Fantasia in C Minor, or Chorale Fantasy for piano, chorus and orchestra.

For the piano aspect of the epic piece, the symphony invited a familiar face to their loyal audience, pianist Ryan MacEvoy McCullough, a frequent guest of the symphony.

“Everybody loves (McCullough) so much that we just keep having him back,” Joos said. “He’s just delightful. He’s a fabulous player, is very fun to watch and is extremely talented. And he’s only, like, 24.”

For each of the symphony’s performances, Joos explains that a theme is chosen not only to provide cohesion but to help the audience become familiar with the music.

“In order to make the concerts interesting for the public, it’s always a good idea to have a theme associated with the concert,” she said. “It unifies the music in the concert and creates more interest for the audience to have a theme. Almost all of our concerts have a theme.”

For the second half of the production, Parnther and symphony will continue with the same theme as Beethoven’s masterpiece, but with a contemporary theatrical twist.